Improvement in elastic syringes



two different substances were made in one UNITED STATES PATENT OEEIcE.

HLD. LOCKWOOD, OF CHARLESTOWN, MASSACHUSETTS.

IMPROVEMENT IN ELASTIC SYRINGES.

Specification forming part of Letters Patent No. 39,662, dated August 25, 1863.

To all whom it may concern Be it known that I, H..D.`LooKwooD, of Charlestown, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Elastic Syringes; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, making a part 0f this specification, said drawing being a longitudinal central section of the elastic bulb ot' a syringe with my improvement applied t0 it, and also bisected.

This invention relates to an improvement in that class of syringes in which 'an elastic bulb is employed to serve as a pump or as a suction and force device.

The object of the invention is to obtain a more durable connection than hitherto ofthe suction and force tubes to the bulb, so that the joints which form said connections will not be liable to work loose and leak by the coinpression and expansion of the bulb.

To enable those skilled in the art to fully understand and construct my invention7 Iwill proceed to describe it.

A represents the bulb of the syringe, which may be of the usual ellipsoidal form and ccnstructed of vulcanized rubber. In each end of this bulb there is tted a metal socket, B, the inner ends of which are provided with anges or heads a for the ends ot' the bulb to close over. These sockets are fitted in the bulb A, previous to its being vulcanized, and by the process of vulcanizing, the rubber h'rmly adheres to the socketsequally so as if the piece or of one material. A similar result may be obtained by subjecting the bulb, after the sockets are fitted into it, to a high heat, but I prefer the former process, believing it to be the most reliable one. The sockets B B are tubes and are provided with internal screwthreads, into which tubular screens b are-fitted, said tubes being connected with cylindrical chambers c, into which tubes C are screwed, leaving small knots d at their outer ends for the elastic suction and force tubes to be fitted over. In the drawing the force-tube D is shown connected to its tube C, the suctiontube not being shown, nor its tube C. Within each chamber c a small check-valve, e,is fitted. By this arrangement the suction and force tubes are permanently connected to the bulb A,'and the latter may be compressed and allowed to expand without danger of the rubber becoming detached from the sockets B, and the instrument, therefore, will always work efciently until worn out. These elastic syringes are very simple and are generally preferred to all others for enemagiving purposes. The difculty, however, of forming a tight and durable connection ofthe suction and force-tubes to the bulb has Vprevented their general or universal adoption-a difculty which is fully obviated by my invention.

I would remark that the tubes G may be secured in the suction and force tubes in the same way as said tubes are secured to the bulb, but that will scarcely be necessary, as there is no material strain on the joints which form the connections of the suction and forcetubes with the tubes C.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The metallic sockets B B, fitted in the ends of the elastic bulb A, and secured therein by subjecting the bulb and sockets to a high heat during the process of vulcanizing or otherwise, in connection with the chambers c, tubular screens b, and tubes U, all arranged substantially as shown, to form joints or connections between the suction and force tubes D and bulb A of an elastic syringe.

H. D. LOCKWOOD.

Witnesses:

M. S. PAETRIDGE, vDANIEL RoBERrsoN. 

